linux-kernel - [PATCH v2] staging: rtlwifi: Fix potential NULL pointer dereference of kzalloc

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Message-Id: <20190319201509.16252-1-pakki001@umn.edu>
Date:   Tue, 19 Mar 2019 15:15:08 -0500
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] staging: rtlwifi: Fix potential NULL pointer dereference of kzalloc

phydm.internal is allocated using kzalloc which is used multiple
times without a check for NULL pointer. This patch avoids such a
scenario.

--
v1: Patch collision with different things, fix as per Greg
Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 drivers/staging/rtlwifi/phydm/rtl_phydm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/rtlwifi/phydm/rtl_phydm.c b/drivers/staging/rtlwifi/phydm/rtl_phydm.c
index 9930ed954abb..a7932706f286 100644
--- a/drivers/staging/rtlwifi/phydm/rtl_phydm.c
+++ b/drivers/staging/rtlwifi/phydm/rtl_phydm.c
@@ -180,6 +180,8 @@ static int rtl_phydm_init_priv(struct rtl_priv *rtlpriv,
 
 	rtlpriv->phydm.internal =
 		kzalloc(sizeof(struct phy_dm_struct), GFP_KERNEL);
+	if (!rtlpriv->phydm.internal)
+		return -ENOMEM;
 
 	_rtl_phydm_init_com_info(rtlpriv, ic, params);
 
-- 
2.17.1